Nonreciprocal quantum transport at junctions of structured leads

Eduardo Mascarenhas, François Damanet, Stuart Flannigan, Luca Tagliacozzo, Andrew J. Daley, John Goold, Inés De Vega

Research output: Contribution to journalArticle

1 Citation (Scopus)
4 Downloads (Pure)

Abstract

We propose and analyze a mechanism for rectification of spin transport through a small junction between two spin baths or leads. For interacting baths, we show that transport is conditioned on the spacial asymmetry of the quantum junction mediating the transport, and attribute this behavior to a gapped spectral structure of the lead-system-lead configuration. For noninteracting leads, a minimal quantum model that allows for spin rectification requires an interface of only two interacting two-level systems. In our paper, we have performed a thorough study of the current, including its time dependence and steady-state value. We obtain approximate results with a weak-coupling Born master equation in excellent agreement with matrix-product-state calculations that are extrapolated in time by mimicking absorbing boundary conditions. These results should be observable in controlled spin systems realized with cold atoms, trapped ions, or in electrons in quantum dot arrays.

Original languageEnglish
Article number245134
Number of pages9
JournalPhysical Review B
Volume99
Issue number24
DOIs
Publication statusPublished - 19 Jun 2019

Fingerprint

Lead
Trapped ions
rectification
Semiconductor quantum dots
baths
Boundary conditions
Atoms
Electrons
time dependence
quantum dots
asymmetry
boundary conditions
products
configurations
atoms
ions
electrons

Keywords

  • quantum transport
  • quantum dot arrays
  • steady-state values

Cite this

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Nonreciprocal quantum transport at junctions of structured leads. / Mascarenhas, Eduardo; Damanet, François; Flannigan, Stuart; Tagliacozzo, Luca; Daley, Andrew J.; Goold, John; De Vega, Inés.

In: Physical Review B, Vol. 99, No. 24, 245134, 19.06.2019.

Research output: Contribution to journalArticle

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AU - Mascarenhas, Eduardo

AU - Damanet, François

AU - Flannigan, Stuart

AU - Tagliacozzo, Luca

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AU - De Vega, Inés

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AB - We propose and analyze a mechanism for rectification of spin transport through a small junction between two spin baths or leads. For interacting baths, we show that transport is conditioned on the spacial asymmetry of the quantum junction mediating the transport, and attribute this behavior to a gapped spectral structure of the lead-system-lead configuration. For noninteracting leads, a minimal quantum model that allows for spin rectification requires an interface of only two interacting two-level systems. In our paper, we have performed a thorough study of the current, including its time dependence and steady-state value. We obtain approximate results with a weak-coupling Born master equation in excellent agreement with matrix-product-state calculations that are extrapolated in time by mimicking absorbing boundary conditions. These results should be observable in controlled spin systems realized with cold atoms, trapped ions, or in electrons in quantum dot arrays.

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